Probably the best airdrop/bounty i've seen is the Ludena Protocol one as they are giving away ETHEREUM in addition to their LDN tokens. I think iit shows the project is legitamate
Good, but their budget is too low. They only gave a 24ETH budget for a few months of bounty hunter work, and eventually everyone would get a few cents from their work. I like projects that pay with ETH but they have to come up with a suitable budget